.comm_header{
    height: 90px;
    >div{
        background: $c_1f88f2;
        position: fixed;
        z-index: 20;
        top: 0;
        left: 0;
        @include widthHeightLine(100%,90px);
        color: $c_FFF;
        text-align: center;
        .icon{
            @include widthHeightLine(90px);
            color: $c_FFF;
            display: block;
            position: relative;
            &.back::after{
                content: "";
                @include heightWidth(20px);
                transform: rotate(-45deg);
                display: inline-block;
                border-left: 4px solid $c_FFF;
                border-top: 4px solid $c_FFF;
            }
            &.hide{
                visibility: hidden;
            }
            &.hide_none{
                display: none;
            }
        } 
    }
}